Compressed-air drill.



N0. 692,393. Patented Feb. 4, |902. F. WEIMI'Z. COMPBESSED AIR DRILL.

(Application tiled Jan. 5, 1901.)

(No Model.)

1H: sums PETERS cu. Pnoouwo.. wAsmNamN.

N0. 692,393. v Patented Feb. 4, |902.

F. WE|MAR. COMPRESSED AIR DRILL.-

(Apl c mda' 51901 2 Shee ts -Sheet 2.

(No Model.)

UNTTED STATES PATENT OFFICE.

FRED VVEIMAR, OF CHICAGO, ILLINOIS, ASSIGNOR OF 'lWO-THIRDS TO S. A. FRENCH, OF CHICAGO, ILLINOIS, AND T. D. HEWITT, OF FREF- POR'I, ILLINOIS.

COMPRESSED-AIR DRILL.

SPECIFICATION forming part of Letters Patent No. 692,393, dated February 4, 1902.

Application tiled January 5,1901. v Serial No. 42,207.

To caf/ZZ whom t may concern,.-

Beit known that I, FRED W'EIMAR, a citizen of the United States of America, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Compressed-AirDrills, of which the following is a specification.

My invention relates to certain improvements in compressed-air drills designed for the purpose of making a compact, easily-operating, and durable motor for usefin such drills, and to such end consisting in certain novel characteristics, which will be fully described and claimed below.

In the drawings, Figure lis a longitudinal median section in line l l of Fig. 2. Fig. 2 is a longitudinal section in line 2 2 of Fig. 1. Fig. 3 is a transverse section in the broken line 3 3 of Fig. l. Fig. 4 is a transverse section in the line 4 el. of Fig. 1. Fig. 5 is a transverse section in the line 5 5 of Fig. l. Fig. 6 is a detail section in line 6 6 of Fig. 5, and Fig. 7is a transverse section inline 77ofFig. 1.

Referring to these drawings, A is a suitable casing provided, preferably, at both ends with air-cylinders a a', an air-chest a2 being' connected to the cylinders by means of oblique ports 0.3 at and with a suitable supply-pipe by means of a port a5. Said case is also provided with ways a6 a7 at each end, in which is tightly fitted a slide-valve B, provided with diagonal ports b and adjacent straight ports b. The diagonal ports when in proper position are adapted to connect the two portions of the compressed-air ports, and the straight ports are adaptedl to connect the' inner portions of the air-ports with the exhaust-ports as a9. The slide-valve has an odset middle portion B, affording shoulders b2 b3. The cylinders are provided, respectively, with pistons C C', from which piston-rods c c' extend to a rectangular frame C2, adapted to engage the shoulders b2 b3 during the last portion of its movement in each direction and inclosing two gears D D', journaled in the casing, as shown in Fig. 5, and having rotatably mounted within them a concentric chuck E, provided within the gears with ratchet-teeth e. Each of the gears is provided with a pawl d, pressed by a spring d toward the ratchet- (No model engage, respectively,

posite directions. They alternately rotate 6o the chuck E in the proper direction by means of the pawls and ratchet teeth, and said chuck is provided with a socket e to receive the shank ot` the drill Fand is preferably litted with a pin G, screw-threaded in the opposite end and provided with a hand-wheel g, by means of which the pin may be rotated 'to advance the drill to its work. The frame is preferably guided between antifrictiom.

rollers H and as it moves back and forth op- 7o erates the slide-valve to reverse the action of the air.

I claim as new and desire to secure by Letters Patent- 1. The .combination with a portable reciprocating-engine cylinder and its piston, of a flexible pipe for delivering motive luid to the cylinder, a rigid frame extending from the cylinder alongside the path of the piston-rod, two gears mounted in upon an axis perpendicular to the axisof the cylinder, two racks connected directly to the piston-rod, to reciprocate therewith, and engaging the two gears, respectively, but upon said frame tio -rotate 8o opposite sides, a tool-chuck mounted in the common axis of the gears, clutch devices arranged to transmit to the chuck like alternate movements of the gears, and a slidevalve operated directly by parts accompanying the piston in its reciprocation.

2. Th rocating engine and its piston, of a rigid frame extending from the cylinder alongside the path of the piston-rod, two gears mounted in said frame torotate abouta common axis, a rigid rack-frame connected directly to the outer end ofthe piston-rod and provided with two sets of rack-teeth engaging said. gears, respectively, but upon opposite sides, a chuck mounted centrally S e combination with a portable recipwithin said gears, clutch roo mechanism arranged to transmit to said chuck like alternate movements of the gears, and a slide-valve extending outward alongside the path of the rack-frame and provided with shoulders in position to be struck alternately Y by the rack-frame near th-erlimits of its movements.

3. 1n devices of the class described,'the coinbination with two engine-cylinders having a common axis, of a suitable'fcasing connecting the cylinders, two gears mounted in the casing to rotate abouta common axis transverse to that of the cylinders, a tool-holding chuck lying in the axis of the gears, ratchet devices connecting the gears with Vthe chuck, to r0- tate it, two racks engaging the gears, respectively, a piston in each cylinder, a piston-rod connecting each piston with the corresponding ends of the racks, and means for operatingr the pistons.

4. The combination with the casing, A, having the cylinders, a, a', ot' the pistons, C, C', the piston-rods, c, c', the frame, C2,

secured atits opposite ends to the piston-rods', and provided with the racks; c2, c3, the two gears respectively in mesh With the respective racks and journaled in the casing, the

chuck journaled in the gears and provided with ratchet connections therewith tending to rotate in the same direction, suitable air and exhaust ports in the casing, and the slide- 'Valve, B, provided with suitable ports and having the shoulders, b2, b3, adapted for engageinent with the frame, C2, to shift the valve; substantially as described.

5. In a device of the class described, the combination with the casing, A, provided with suitable cylinders, air-chest, oblique airports,0t3, 01,4, and adjacent exhaustports,as,a9,

Yof the slide-valve, B, guided in the casing and having the oblique air-ports, b, adapted to register and line up with the ports, a3, a4, and the adjacent ports, b', adapted to connect the inner portions of the air-ports with the exhaust-ports, as, a9; substantially as described. In witness whereof I have hereunto set my hand, at Chicago, in the county of Cook and State of Illinois, this 22d day of December, A. D. 1900.

FRED VEIMAR.

XVtnesses:

CHAs. O. SHERVEY, S. BLI'ss. 

